How can I find out if a component is registered or not?

Is there any APIs for that? say to find out if Common Dialog is registered on a machine or not:rolleyes:

:cool:

You can try to open the key and read the default value for the key.

If Word.Picture is registered, for example, the location is:
HKEY_CLASSES_ROOT\Word.Picture

hmm, looks like yummy!:p

I just want to know another thing: I have a Main sub in a odule, if I check for the component before the form that contains the component loads, I wont get error messages if it is not registered, right?